HT1647 datasheet(21/24 Pages) HOLTEK

21 / 24 page

Instruction Set Summary

Name

Command Code

D/C

Function

Def.

READ

A8110-A7A6A5A4A3A2A1A0D3D2D1D0 D Read data from the RAM

WRITE

A8101-A7A6A5A4A3A2A1A0D3D2D1D0 D Write data to the RAM

READ-

MODIFY-

WRITE

A8101-A7A6A5A4A3A2A1A0D3D2D1D0 D Read and Write data to the RAM

SYS DIS

X100-0000-0000-XXXX

C Turn Off both system oscillator

and LCD bias generator

Yes

SYS EN

X100-0000-0001-XXXX

C Turn On system oscillator

LCD OFF

X100-0000-0010-XXXX

C Turn Off LCD display

Yes

LCD ON

X100-0000-0011-XXXX

C Turn On LCD display

TIMER DIS X100-0000-0100-XXXX

C Disable time base output

Yes

WDT DIS

X100-0000-0101-XXXX

C Disable WDT time-out flag output Yes

TIMER EN X100-0000-0110-XXXX

C Enable time base output

WDT EN

X100-0000-0111-XXXX

C Enable WDT time-out flag output

TONE OFF X100-0000-1000-XXXX

C Turn Off tone outputs

Yes

CLR

TIMER

X100-0000-1101-XXXX

C Clear the contents of the time base

generator

CLR WDT X100-0000-1111-XXXX

C Clear the contents of the WDT

stage

TONE 4K

X100-0001-0000-XXXX

C Turn on tone output, tone

frequency output: 4kHz

TONE 2K

X100-0001-0001-XXXX

C Turn on tone output, tone

frequency output: 2kHz

IRQ DIS

X100-0001-0010-XXXX

C Disable IRQ output

Yes

IRQ EN

X100-0001-0011-XXXX

C Enable IRQ output

RC 32K

X100-0001-0100-XXXX

C System clock source, on-chip RC

oscillator

Yes

EXT

(XTAL)

X100-0001-0101-XXXX

System clock source, external

32kHz clock source or crystal

oscillator 32.768kHz

LARGE

BIAS

X100-0001-0110-XXXX

C Large bias current option

Yes

MIDDLE

BIAS

X100-0001-0111-XXXX

C Middle bias current option

HT1647

April 21, 2000

HT1647 Datasheet(PDF) 21 Page - Holtek Semiconductor Inc

HT1647 Datasheet(HTML) 21 Page - Holtek Semiconductor Inc

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